UIImagePNGRepresentation ..... writeToFile 总是横向的

Question

每次我使用相机拍摄照片并保存时，图片总是横向的。这意味着我在Xib中的UIImageView方向是错误的。它应该是纵向的，这也是我所期望的。我可以通过将图像旋转90度来更正这个问题，但即使这样，我也无法禁用动画来显示原始的横向照片，以及接下来的旋转动画本身。如何确保从相机获取的UIImageView实际上处于纵向模式而不是横向模式，并且如何在CGAffineTranformationMakeRotation期间禁用动画？

- truescot

Answer 1

我发现这篇帖子非常有用，它描述了在保存图像之前添加UIImage类别以旋转图像的方法：

http://www.platinumball.net/blog/2009/03/30/iphone-uiimage-rotation-and-mirroring/

然后，一旦实现了该类别，您可以执行以下操作：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    UIImage *originalImage, *editedImage, *rotatedImage;

    editedImage = (UIImage *)[info objectForKey:UIImagePickerControllerEditedImage];
    originalImage = (UIImage *)[info objectForKey:UIImagePickerControllerOriginalImage];

    if (editedImage) 
    {
        rotatedImage = [editedImage rotate:UIImageOrientationRight];
    } 
    else 
    {
        rotatedImage = [originalImage rotate:UIImageOrientationRight];
    }

    NSString *f = @"/set/this/to/your/file/name"; 
    [UIImagePNGRepresentation(rotatedImage) writeToFile:f atomically:YES];

    [[picker parentViewController] dismissModalViewControllerAnimated:YES];
    [picker release];
}

- BP.